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On my desktop PC I have a speakers and a headphones. Usually I use headphones, but when I need to switch to speakers I need to physically plug in speakers instead of headphones to my PC’s soundcard. I wanted to solve this problem for a long time, but never get around of that until recently …

First fully working revision of firmware is finished, which takes all 2k of ATtiny2313′s memory. I wrote it in C, and I wanted to implement some other functionality, but unfortunately I’m out of space(of course if I would want to, I can put there ATtiny4313, which is identical to ATtiny2313, but has 4k of memory). …

In the review of this thermometer I said that it was a weird Chinese product. And here’s why: despite of the poor firmware and software functionality it has pretty interesting and very “hackable” innards. Let’s begin..

Very often in electronics you would need to measure temperature, not just in one spot, but simultaneously in two or more spots. And log that measurements, so that you can plot temperature change over time. Also, differential temperature measurements could be extremely useful in some cases, especially for thermal design of electronic projects. So, the …

Very often when designing some stuff I need a square wave signal generator with variable pulse width and frequency to control power MOSFETS. You can use such a tool when designing DC-DC converter or switch-mode power supply, you can use it to emulate PWM from microcontroller when developing some new embedded design, or maybe you …

Some time ago, after I started adding stuff to EEVBlog wiki page (http://eevblog.com/wiki), I thought why not to make a post about electronic-related websites that I like. So, here’s my portion of links to electronic-related resources that I find interesting and useful: Video-Based Blogs: EEVblog(www.eevblog.com) – Tutorials, equipment reviews, live shows, etc. Afrotechmods – Lots …

About one month ago I had a request to write about break-beam sensors. So, here it is! Well, basically break beam sensor consists of two parts: transmitter and receiver. Transmitter emits light (it could be, for example, an LED or a laser) and that light goes to receiver. If that light beam between transmitter and …

ATtiny2313 – Based thermostat project update. I wrote a small test firmware for it to test if everything is wired up the right way and to test it’s current consumption. And it turns out that there were some mistakes.. Also it’s current consumption is well below 150mA that I was expecting.

So I’ve came back to my ATtiny2313 – based thermostat project, that I’ve started to work on some time ago. And today I have assembled a first prototype (actually I only need a couple of these). If you haven’t seen video I’ve made on this project, you can watch it here: Part1 Video. It’s based …